In practice, a simple X-ray is usually sufficient for diagnosis and monitoring.
However, in some cases, other tests may be prescribed: arthrography, scan, scintigraphy; MRI and arthroscopy provide more details on how badly the cartilage is affected and enable better visualisation of its destruction and / or bone reaction.
It is unusual to resort to a synovial biopsy as its practical value is very limited.
To monitor the progress of your arthritis or during an inflammatory flare-up, your doctor may (but not obligatorily) confirm this diagnosis by prescribing additional tests for you.
This may include: